1 million teraseconds (or 1 quintillion seconds) is called an exasecond, and is equal to 32 billion years, or roughly twice the age of the universe at current estimates (the universe is currently thought to be a bit less than 14 billion years old).

1.08 Es (34 billion years) – estimated lifetime of the universe, assuming the Big Rip scenario is correct;[4] experimental evidence currently suggests that it is not[5]

1.310019×1012 Ys (4.134105×1028 years) – The time period equivalent to the value of 13.13.13.13.13.13.13.13.13.13.13.13.13.13.13.13.13.13.13.13.0.0.0.0 in the Mesoamerican Long Count, a date discovered on a stela at the Coba Maya site, believed by archaeologist Linda Schele to be the absolute value for the length of one cycle of the universe[7][10]

10101076.66{\displaystyle 10^{10^{10^{76.66}}}} Ys (10101076.66{\displaystyle 10^{10^{10^{76.66}}}} years) – Scale of an estimated Poincaré recurrence time for the quantum state of a hypothetical box containing an isolated black hole of stellar mass[14] This time assumes a statistical model subject to Poincaré recurrence. A much simplified way of thinking about this time is that in a model in which history repeats itself arbitrarily many times due to properties of statistical mechanics, this is the time scale when it will first be somewhat similar (for a reasonable choice of "similar") to its current state again.

101010120{\displaystyle 10^{10^{10^{120}}}} Ys (101010120{\displaystyle 10^{10^{10^{120}}}} years) – Scale of an estimated Poincaré recurrence time for the quantum state of a hypothetical box containing a black hole with the mass within the presently visible region of the Universe.[14]

1010101013{\displaystyle 10^{10^{10^{10^{13}}}}} Ys (1010101013{\displaystyle 10^{10^{10^{10^{13}}}}} years) – Scale of an estimated Poincaré recurrence time for the quantum state of a hypothetical box containing a black hole with the estimated mass of the entire Universe, observable or not, assuming Linde's chaotic inflationary model with an inflaton whose mass is 10−6Planck masses.[14]